A black stripe would be what we refer to as a three wire. One output wire, & two small wires together in a connector. One is sense lead for regulator, other is exciting lead from ign. Many new or rebuilt replacement ones will have a third spade where the two wire connector hooks up to. It requires a different connector to get all three terminals. That one is to run a relay on other applications or a tachometer on some machines. There are two style of brush holders in those alternators. The early alternators has sliding brush and only had the two terminals, and the later alt had a swinging brush and those had the third connector which , like I said is normally not used on the tractors. The cheap part store alternators are the sliding brush style which the vibrations from the diesel engines cause those brush's to work in their holder and get a groove and thus stick.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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